Update get-started.rst for neuron-explorer

[awslucashendren]

Update the document to use neuron-explorer and leave a note about neuron-profiler

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Description: Update the document to use neuron-explorer and leave a note about neuron-profiler
https://t.corp.amazon.com/D372418505/overview

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Approvers

Trivial Change - @erickson-doug

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Engineering reviewer checklist

• I've confirmed that the contributions in this PR meet the current AWS Neuron writing guidelines.
• I've confirmed that the documentation submitted is technically correct to the best of my knowledge.
• I've confirmed that the documentation submitted has no spelling or grammar errors or use of internal jargon/terminology.
• I've verified the changes render correctly on RTD (link above).
• (If code is included) I've run tests to verify the contents of the change.

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[edwon-aws]

--ui-mode latest isn't supported.
You can remove --ui-mode latest